CFM-Schiller GmbH Fundamentals of Vibration Isolation

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	FOUNDATION BLOCK
	T-SLOT BASEPLATES
	ANCHOR FRAME
	4 POSTER TEST SYSTEM
	FULL CAR TEST SYSTEM


	FUNDAMENTALS
	VIBRATION ISOLATORS
	AIR SPRINGS
	- ADVANTAGES
	- SINGLE CONVOLUTION
	SERIES BZ
	- ROLLING LOBE
	SERIES RB
	- BELTED
	SERIES GRB
	GRB WITH DAMPER
	GRB W/ VISCO DAMPER
	SERIES SRB - SQUARE
	- MEMBRANE CONVOLUTION
	SERIES MBZ
	- MEMBRANE AIRSPRINGS
	SERIES MAS (NEW)
	STEEL SPRINGS
	LEVEL CONTROL SYSTEM.
	THE SOFIA PROJECT

Fundamentals of Vibration Isolation

The goal of vibration isolation is to isolate either the vibrating object (active isolation) or the object that must be protected against vibration (passive isolation) from its surrounding. This is realized by interposing springs in order to make the particular object an independent, oscillatory system.
The interference suppression functions as follows: The frequencies must be coordinated in such a way that the cyclic movements of the system are no longer synchronized but anti-phased with the interference. That means that when the exciting power directed downwards has reached its maximum, the vibrating object is in its highest position, i. e. it swings contrary to the exciting power.
To reach an effective isolation of oscillation the frequency quotient must become as high as possible:

When the frequency quotient

has a value

, we call it vibration isolation.
When designing a resilient bedding, you must choose the natural frequency so that it is out of the resonant area. If the exciting frequency is in phase with the natural frequency, you might face unstable oscillations.
In general you reach an effective vibration isolation by a low frequency tuning, i. e. a high frequency quotient. A high damping D influences the isolation efficiency in a negative way, because in this case dynamic forces will be transferred into the ground. Nevertheless a certain damping of the isolation elements is necessary in order to avoid high vibration amplitudes in the resonant area as well as too fast swinging at shock excitation.

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